Growth performances and hemato-immunological responses of common carp (Cyprinus carpio Linnaeus, 1758) to fermented Aspergillus oryzae

Abstract

Using feed additives ingredients to increase the feeding efficiency and immune response is fishes. The present study investigates the effects of varying levels of dietary fermented Aspergillus oryzae (0 g Kg-1 as control group, 10, 20 and 30 g Kg-1) on performance and hemato-immunological indices of common carp (Cyprinus carpio) fry. Common carp fry (n= 240, w= 4.56 ± 0.17 g) were supplied, randomly stocked in 12 aquaria and fed with experimentally diets for 7 week. The results revealed no significant differences between performance parameters of fermented A. oryzae fed test and control diets (P ˃ 0.05). Also, evaluation of haematological parameters (RBC, Hct, Hb) and white blood cell (WBC) counts showed no notable changes between experimental groups (P ˃ 0.05). However, respiratory burst activity was meaningfully higher in fish fed fermented A. oryzae compared control group (P < 0.05). The present results showed that possible effects of administration of fermented A. oryzae on immune responses in carp fry.<br />